/**
 * Copyright (c) 2010, Sebastian Sdorra
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of SCM-Manager; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */



package sonia.scm.security;

//~--- non-JDK imports --------------------------------------------------------

import sonia.scm.SCMContext;
import sonia.scm.util.ServiceUtil;

/**
 *
 * @author Sebastian Sdorra
 * @since 1.7
 */
public final class CipherUtil
{

  /** Field description */
  private static volatile CipherUtil instance;

  //~--- constructors ---------------------------------------------------------

  /**
   * Constructs ...
   *
   */
  private CipherUtil()
  {
    keyGenerator = ServiceUtil.getService(KeyGenerator.class);

    if (keyGenerator == null)
    {
      keyGenerator = new UUIDKeyGenerator();
    }

    cipherHandler = ServiceUtil.getService(CipherHandler.class);

    if (cipherHandler == null)
    {
      cipherHandler = new DefaultCipherHandler(SCMContext.getContext(),
        keyGenerator);
    }
  }

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @return
   */
  public static CipherUtil getInstance()
  {
    if (instance == null)
    {
      synchronized (CipherUtil.class)
      {
        if (instance == null)
        {
          instance = new CipherUtil();
        }
      }
    }

    return instance;
  }

  //~--- methods --------------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param value
   *
   * @return
   */
  public String decode(String value)
  {
    return cipherHandler.decode(value);
  }

  /**
   * Method description
   *
   *
   * @param value
   *
   * @return
   */
  public String encode(String value)
  {
    return cipherHandler.encode(value);
  }

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @return
   */
  public CipherHandler getCipherHandler()
  {
    return cipherHandler;
  }

  /**
   * Method description
   *
   *
   * @return
   */
  public KeyGenerator getKeyGenerator()
  {
    return keyGenerator;
  }

  //~--- fields ---------------------------------------------------------------

  /** Field description */
  private CipherHandler cipherHandler;

  /** Field description */
  private KeyGenerator keyGenerator;
}
